I think that the most important answer to this question is: "At what temperature do we start doing damage to our tops? Does a low temperature affect the canvas (probably not if it is dry), does it affect the hydraulics (thicker fluid, more friction?), does it affect pressure on the structure which in turn puts more strain on the electric motors (probably a definite yes)?" This is a car that will be very difficult, if not impossible to get repairs for a worn out top in a few years. With the bun warmers, dash heat and dressing correctly the Crossfire is warmer than any snowmobile even at 0 degrees Fahrenheit. However, even though this is a German design I worry more about a low temp hurting the top than I do about having to clean off a little bit of salt from the body.